Subsurface Crack Initiation and Propagation Behavior in Very High Cycle Fatigue of Stainless Casting Steel

2002 ◽  
Vol 2002 (0) ◽  
pp. 777-778
Author(s):  
Yujiro NAKATANI ◽  
Daijiro FUKUDA ◽  
Masao ITATANI ◽  
Yoshiyasu ITOH
Keyword(s):  
Crack Initiation ◽  
High Cycle Fatigue ◽  
Cycle Fatigue ◽  
Subsurface Crack ◽  
Crack Initiation And Propagation ◽  
Propagation Behavior ◽  
Very High Cycle Fatigue ◽  
Initiation And Propagation ◽  
Casting Steel ◽  
Very High

Review on Surface Failure Mode of Metallic Materials in Very High Cycle Fatigue Regime

2013 ◽  
Vol 652-654 ◽  
pp. 1295-1300
Author(s):  
Dong Ming Wang ◽  
Wei Li ◽  
Ping Wang ◽  
Wei Xian Chu
Keyword(s):  
Crack Initiation ◽  
Surface Crack ◽  
High Cycle Fatigue ◽  
Metallic Materials ◽  
Crack Initiation And Propagation ◽  
Surface Failure ◽  
Very High Cycle Fatigue ◽  
Initiation And Propagation ◽  
Very High ◽  
Surface Crack Initiation

With higher cleanness upgraded steadily, surface failure of metallic materials in very high cycle fatigue (VHCF) regime beyond 107 cycles has been reported one after another. The occurrence of surface crack initiation to failure in VHCF regime is closely related to the following factors: (i) surface finishing condition of specimen, i.e. whether some grinding scratches, grooves and cavities with a relatively larger size than the subsurface defect exist at the surface of specimen; (ii) type, size, location, distribution and density of metallurgical defects such as inclusion contained in the subsurface of material; (iii) degree of persistent slip band (PSB) deformation induced by surface roughening of specimen, mainly corresponding to the some ductile single-phase metallic materials. Furthermore, the effect of environment such as humidity also accelerates surface crack initiation and propagation in VHCF regime. In the present paper, the authors briefly reviewed surface failure modes of metallic materials in VHCF regime beyond 107 cycles, and analyzed the surface crack initiation and propagation mechanisms from the viewpoints of the fracture mechanics and statistics.

Very High Cycle Fatigue Behavior and Thermographic Analysis of High Strength Steel

2010 ◽  
Vol 118-120 ◽  
pp. 948-951
Author(s):  
Chuang Shao ◽  
Claude Bathias ◽  
Danièle Wagner ◽  
Hua Tao
Keyword(s):  
Crack Initiation ◽  
High Strength Steel ◽  
High Cycle Fatigue ◽  
Fatigue Testing ◽  
Fatigue Behavior ◽  
High Strength ◽  
Cycle Fatigue ◽  
Subsurface Crack ◽  
Very High Cycle Fatigue ◽  
Very High

Very high cycle fatigue behavior of high strength steel, were investigated using ultrasonic fatigue testing equipment at 20 kHz up to 109cycles. S-N curves at room temperature with different stress ratio (R=0.01 and R=0.1) was determined. The experimental results show that fatigue strength decrease with increasing number of cycles between 105 and 109. SEM examination of fracture surface reveals that fatigue damage was governed by the formation of cracks, and subsurface crack initiation was in the very long life range. The results shown that the portions of life attributed to subsurface crack initiation between 107 and 109 cycles are 99%.

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